[amsat-bb] Re: Commercial Mode L Antenna sources

[Edward Cole]

At 04:15 AM 7/2/2008, Alan P. Biddle wrote:
>Ron,
>
>I have an M2 23CM35EZ which works very well with AO-51.  Overkill on AO-51,
>and probably marginal for P3, though they are easy to stack for gain.
>http://www.m2inc.com/products/uhf/23cm/23cm35ez.html
>
>If you want to go with a commercial helix, Directive Systems makes the
>DSH23-12.  A friend bought one, and in fact got them to make one with a few
>more turns in it.  It worked well, and is certainly designed to withstand
>the elements.   http://www.directivesystems.com/new.htm
>
>Alan
>WA4SCA

Alan,

Dale, KL7XJ uses one of the Directive Systems Helix antennas for 
Mode-LU on AO-51 driving with his IC-910H 1.2 GHz module and this 
works well for him.  Hopefully he can fill you in with details.  He 
brought his portable trailer-mounted az-el satellite array to FD but 
had failure in his Sat AZ-EL controller power supply (24vac) which 
prohibited antenna movement.  He is using a Gulf-Alpha VHF/UHF yagi 
designed for satellite operation. with the Helix.

The 35EZ antennas was used by a few folks on AO-40 Mode-LS, but 
either they stacked them or ran more power.  I would guess you might 
want at least a 2x array and 20w for P3E (but no link analysis has 
been published to my knowledge).



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73, Ed - KL7UW              BP40iq, 6m - 3cm
144-EME: FT-847, mgf-1801, 4x-xp20, 185w
http://www.kl7uw.com     AK VHF-Up Group
NA Rep. for DUBUS: dubususa at hotmail.com
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